'rx5808_etheli_diversity' Firmware
for RX5808 Diversity Modules

This "etheli" version of the open-source firmware for RX5808
Diversity modules (that plug into Fatshark Dominator goggles) is an
enhancement to the RX5808 Diversity RealAcc Compatible firmware.
The main improvement is the addition of a BY-MHZ MODE that allows an
arbitrary frequency in MHz to be directly dialed in and tuned.
Other enhancements and improvements are implemented; see the list below.

The Realacc RX5808 PRO PLUS module has a USB port and can connected directly to a PC for updates.

To update the older RX5808 modules, a 5-volt FTDI adapter
is required. During the update, the RX5808 module needs to be
unplugged from the Fatshark goggles, and the six pins of the FTDI
adapter need to be connected to the pads on the RX5808 module, as shown
in the picture below. A bit of gentle pressure should be applied
during the update to keep the pins in good contact with the pads.

A large rcgroups thread about the RX5808 Diversity modules and firmware may be found here.

To tune an arbitrary frequency in MHz, select the BY-MHZ MODE option in
the menu and then move the select wheel up and down to adjust the
frequency value. A long-press on the select wheel will save the
current frequency as a favorite.

Select the FAVORITES option in the menu to navigate through the saved
frequencies, and a long-press on the select wheel in this mode will
delete the currently-displayed favorite frequency.

Source code changes:

Changed main file from "rx5808_etheli_diversity.ino" to
"rx5808_etheli_diversity.cpp"